Interchangeable punch and die



Oct. 16, 1945. A. c. JACKSON INTERCHANGEABLE PUNCH AND DIE Filed Aug.15, 1944 3 Sheets-Sheet l Oct. 16, 1945. A. c. JACKSON INTERGHANGEABLEPUNCH AND DIE Filed Aug. 15, 1944 3 Sheets-Sheet 2 Oct. 16, 1945. A, c,JACKSON 2,387,027

INTERCHANGEABLE PUNCH AND DIE Filed Aug. 15, 1944 3 Sheet-Sheet 3 atente@et. i, was

INTERGE a Arthur C. Jackson, Swarthmore, Pa, assignor to L. V. Whistler,Kenmore, N. Y.

Application August 15, 1944, Serial No. 549,613

3 Claims.

This invention relates to sheet perforating presses; and moreparticularly to punch and die sets employed therein.

The object of the present invention is to provide mountings or adaptersfor the individual punches and dies respectively, which will bereversible, one for the other, in die and punch holders secured to thebed and the ram respectively of the press.

In most instances the perforating die is carried by the bed of the pressand the perforating punch, which cooperates with the die, is carried bythe movable head or ram of the press. The sheet to be perforated isbetween the die and the punch and rests on the upper face of the die, tobe perforated by the punch when the ram descends.

The slugs successively remove from the sheets by the punch, are forceddownwardly through a channel formed in the die, and are discharged fromthe press through a corresponding channel formed in the bed of thepress. Suitable stops and guides are provided on the bed of the pressfor positioning the sheet in correct perforating position with respectto the die.

In some instances, it is desirable to reverse the above order, 1. e. toplace the die in the vertical reciprocable ram and to hold the punch ina stationary position on the bed of the press, particularly in caseswhere a number of perforations P are to be made in the sheet in a givenpattern, with each perforation in a definite relationship to each of theother perforations made in the sheet. In order to efiect correctpositioning of the perforations, under these circumstances, the patternfor the perforations, particularly when a number of identical sheets areto beperforated, is layed out on a template which is superimposed oneach sheet for marking the spots where the perforations are to be madein the sheet.

The template is provided with a number of small holes arranged in therelative positions where the perforations are to be made in theunderlying sheet. These small holes act as indicators or guides fordrilling corresponding pilot holes in the underlying sheet. The punchesunder such circumstances are provided with small axially projecting titswhich, when the sheet to be perforated is placed in position on theupstanding ends of the punches, project into the pilot holes in thedrilled sheet and hold the sheet against shifting in its own plane whilethe die descends into contact therewith.

The purpose of this invention is to mount the dies and the punches insuch a manner that PUNCH AND his either of the two above-noted methodsof locating the perforations in the sheet to be punched may be used. 1.e. the mountings, including the punch and die adapters, holders, etc.,are so constructed and arranged as to afford readyreversibility of therespective punch and the die. adapters, and the sub-assemblages carriedthereby, bodily in the punch and die holders rigidly secured to the bedand ram respectively of the press.

In the accompanying drawings:

Fig. 1 is a vertical sectional view of sufiiclent of a perforating pressto illustrate the principles of the present invention as appliedthereto, and wherein the punch is mounted on the bed and the die on theram of the press;

Fig. 2 is a view similar to Fig. 1 showing the punch and die reversed inthe press;

Fig. 3 is a view similar to Fig. 2 but showing a modification of theinvention; and

Fig. 4 is a detail of the invention.

As shown in the drawings, the bed of a conventional perforating press isillustrated at I, and the vertically reciprocable ram of the press isillustrated at 2. As usual, the ram 2 is slidably mounted in guides 3, 3secured to or forming part of the main frame of the press, not shown.

Mounted on the bed I is an adapter holder d,

and secured to the ram 2 is an adapter holder 5. The holders 4 and 5 areprovided with identically shaped and dimensioned cavities 6a and 617respectively. These cavities preferably include circular internalcircumferential walls and flat bases, although the interior over-allconfiguration may be of any shape desired.

Mounted in the cavities 6a and 6b are the punch and die adapters 1a andlb respectively, each of which has the same identically shaped anddimensioned exterior configuration as the common internal configurationof the cavities 6a and 6b into which the adapters are adapted to fitsnugly.

Each of the adapters la and lb is provided with a recess 8 at one ormore points around its circumference, which are formed in the side wallof the adapter to receive a flat end of a securing screw 9 which isthreaded into a corresponding hole drilled in the holder 4 or 5, as thecase may be, whereby, by tightening the screw 9, the adapters will beheld rigidly against axial and circumferential movement in the adapterholders 4 and 5 carried by the bed I and ram 2 respectively.

As shown in Fig. 1 the punch adapter In, which in this instance ismounted in the holder 4 carried by the bed i, is axially bored at l0,concentric to the peripheral circular wall ii of the adapter, to receivea diametrically enlarged base portion l2 of a punch i3. The base portioni2 01' the punch I3 is provided with a recess il in its side wall toreceive one end of a locking screw it which is threaded into the adapterla at an angle with respect to the coinciding axes of the punch base l2and adapter Ia, whereby the punch I3 is maintained in fixed relation tothe adapter in.

The die adapter lb, which in this instance, is mounted in the holder 5carried by the ram 2, is axially bored at l6, concentric to theperipheral circular wall I lb of the adapter lb, for the reception ofthe die block ii. The die block I! is provided with a recess ill in itsside wall, which is adapted to receive one end a locking screw i8threaded into the adapter lb atan angle to the coinciding axes of thedie block i1, and adapter lb, whereby the die block ll is held in theadapter lb against axial or rotary movement with respect thereto.

The die block ll is axially bored at 20 for reception of and cooperationwith a flat active end surface 2i of the punch [3, for formingperforations :1: in a sheet y initially placed between the punch and thedie for that purpose. The slugs xi which are removed from the sheets 1;by the punch l3 in producing the perforations a: are forced upwardlyinto the bore 20 of the die block l! by the downward movement of the ram2.

As the ram 2 reverses its direction of movement, the slugs ml areejected from the bore 20 of the die block H, by an ejecting pin 22 whichis slidably mounted in coaxially aligned bores 23 and 24 formed in theadapter lb and adapter holder 5 respectively. The upper end of theejector pin 22 is engaged by an ejector bar 25 which is loosely mountedin a transverse slot 26 formed in the ram 2. The opposite ends of thebar 25 project beyond the opposite sides 21, 21 of the ram 2, to beengaged by adjustable abutments 28, 28 on the fixed ram guides 3, 3,said abutments in the present instance being in the form of screwsmounted in fixed lugs 29, 29 carried by the guides 3, 3 or any otheradjacently disposed fixed portion of the press.

The ejector pin 22 is shouldered, at 30, to bear against the basesurface 3| of the adapter lb, to prevent said ejector pin from fallingout of the ram- 2 after it has ejected a slug mi from the bore 20 of thedie block l'l' as the ram rises.

The sheet 31 is stripped from the end of the punch l3 by a stripperplate 32 which is resiliently mounted on springs 33 carried by a base orplate ring 34 which is secured to the base i2 of the punch l3, saidsprings encircling rods 35, each of which has one of its ends secured inthe stripper plate 32 and its opposite end slidably mounted in the ring34 in the usual manner. A screw 36, having one end projecting into anannular groove 31 formed in the base l2 of the punch i3, retains thestripper assemblage in place with respect to the punch at all times.

When the punch I3 is used on the bed of the machine, as illustrated inFig. 1, the end surface 2i of the punch l3, as previously noted, isprovided with a pilot point or tit 33 which is adapted to project into apilot hole yi formed in the sheet 11, for positioning the sheet 1/ withrespect to the punch for forming the perforations a: in said sheet, asclearly shown in Fig. 4.

As shown in Fig. 2, the adapters la, and lb may be removed from thecavities or recesses la and 6b of the holders I and 5 respectively,together with the die block l1, and the punch II with its stripperassemblage 32-36, which are bodily carried on or supported by theadapters in and lb respectively, and the positions of the adapters etc.reversed, and for end, with the adapter la fitted into the recess 6b ofthe holder 5 and the adapter lb fitted into the recess 8a of the holder1 4. The ejector pin 22 and the ejector bar 2|, under the abovecircumstances, are removed from the press. The bore 23 in the adapter lbis positioned over aligned slug channels 40 and ll formed in the bed iand holder 4 respectively. The tip 38 is removed from the punch i3 or anidentical punch may be substituted therefor.

The successive vertical reciprocation of the ram 2, under thecircumstances noted, causes the punch 13 to remove the slugs :ci fromthe sheet and force them downwardly through the bore 20 of the die blockl1 and bore 23 of the adapter "lb to fall freely from the press throughthe slug channels ll and 40.

As shown in Fig. 3 the adapter holders 4a and a may be bored at 45 toone diameter, to receive and snugly embrace identically dimensionedflanges 4B, 46 formed on the die adapter 1c and punch adapter 1drespectively. The holders in and 5a. are counterbored, to a smallerdiameter, and internally threaded, as indicated at 41, 41, to receivecorrespondingly externally threaded body portions 48, 48 of the adapters1c and Id, for securing said adapters in said holders. Annular recesses49 and 50 may be provided in said holders to give corner clearances forthe adapters when screwed into the threaded recesses in the holders,whereby the base surfaces ii of the adapters will bear flatly andsolidly against base surfaces 52 of the adapter receiving recesses 40formed in the holders 4a and 5a respectively.

I claim:

1. -A punch and die set for use in a press having a pair of primaryelements mounted for relative axial reciprocation for effecting apressing operation between respectively opposed faces thereof, said setcomprising a pair of holders adapted to be rigidly secured to saidelements to extend beyond said faces respectively, a punch unitcomprising a punch, an adapter for the punch, and means for securing thepunch in its adapter, a die unit comprising a die, an adapter for thedie, and means for securing the die in its adapter, said adapters beingof identical shape and size cross-sectionally and said holders havingadapter-receiving recesses of identical crosssectional shape and sizewith tolerance to receive said adapters selectively, said recesses beingadapted to be axially aligned prior to securing said holders rigidly tosaid elements, said units completely assembled being adapted to bereversed in said holders without disturbing the rigid security of saidholders in said elements by exchanging said adapters in said recesses.

2. A punch and die set for use in a press having a pair of primaryelements mounted for relative axial reciprocation for effecting apressing operation between respectively opposed faces thereof, said setcomprising a pair of holders adapted to be rigidly secured to saidelements to extend beyond said faces respectively, a punch unitcomprising a punch, an adapter for the punch, and means for securing thepunch in its adapter, a die unit comprising a die, an adapter for thedie, and means for securing the die in its adapter, said adapters beingof identical shape and size cross-sectionally and said holders havingadapter-receiving recesses of identical crosssectional shape and sizewith tolerance to receive said adapters selectively, said recesses beingadapted to be axially aligned prior to securing said holders rigidly tosaid elements, said units completely assembled being adapted to bereversed in said holders without disturbing the rigid security of saidholders in said elements by exchanging said adapters in said recesses,and means for securing said adapters in said holder recesses.

3. A punch and die set for use in a press having a pair of primaryelements mounted for relative axial reciprocation for efiecting apressing operation between respectively opposed faces thereof, said setcomprising a pair of holders adapted to be rigidly'secured to saidelements to extend beyond said faces respectively, a punch unitcomprising a punch, an adapter for the punch, and means for securing thepunch in its adapter, a die unit comprising a die. an adapter for thedie, and means for securing the die in its adapter, said adapters beingof identical shape and size cross-sectionally and said holders havingadapter-receiving recesses of identical crosssectional shape and sizewith tolerance to receive said adapters selectively, said recesses beingadapted to be axially aligned prior to securing said holders rigidly tosaid elements, said units completely assembled being adapted to bereversed in said holders without disturbing the rigid security of saidholders in said elements by exchanging said adapters in said recesses,said adapters and recesses respectively comprising external and internalwalls including plain circular portions of predetermined diameter andscrew threaded portions of relatively smaller diameter adapted tocooperate for accurately centering and rigidly securing said adaptersinterchangeably in said holders.

C. JACKSON.

